Port views access batch to new plugin mechanism

Problem/Motivation

In #3421703: Move batch functionality into check plugin we've made it possible for a plugin to run in batches, removing the need to create a separate batch process for plugins that need long scan processes. However, the views access still uses the old mechanism. This should be updated.

Proposed resolution

Replace the logic in include_batches/views_access.batch.inc with code in the run() method of Plugin/SecurityCheck/ViewsAccess.php. Refer to Plugin/SecurityCheck/NamePasswords.php for an example. You may refer to the merge request for #3421703: Move batch functionality into check plugin to see how the old implementation was converted to the plugin version.

Remaining tasks

• Do the port
• Create merge request
• Review
• Merge

User interface changes

The views access scan will take place in the main batch progress instead of in a second one after the main one has finished.

API changes

None.

Data model changes

None.